Cable-conduit



(No Model.) v

H: D. WELSH.

CABLE QONDUIT.

Patented July 14, 1885.,

WlTNESSESI N. PETERS. PhMo-Lilhn griphan Waihingflm D- Q UNITED STATES.

PATENT OFFICE.

HENRY D. WELSH, OF PHILADELPHIA, PENNSYLVANIA.

CABLE-CONDUIT.

fi-JP'ECIFICATION forming part of Letters Patent No. 322,225, dated July Application filed May 11, 1885. (No model.)

My invention consists in forming a cableconduit of pyramidal form, whereby the sides of the conduit are not affected by the pressure of the ground when expanded by frost.

It further consists of inside bracings, which strengthen the conduit, as will be hereinafter set forth.

Referring to the drawings, A represents the sides of a cable -conduit, and B the bottom thereof. The shape of the conduit in crosssection is that of a pyramid, the effect of which is to prevent the pressure of the ground,when expanding by frost, from forcing in said sides, and thereby closing the slot, it being evident that the sides of the conduit permit an upward act-ion of the ground by affording an oblique resistance to the pressure thereof.

0 represents a brace formed of two pieces, which in Fig. 1 are flanged at their upper and lower ends, the upper flanges conforming to the diagonal sides of the conduit and the lower flanges with the floor thereof, the upper flanges being riveted to said sides and thelower flanges to said floor; and the floor is furthermore riveted to the flanges of angle or channel irons or bearings D, the latter being 40 placed at the bottom of the trench within which the conduit is laid. The upper ends of the braces support the slot-irons, and thus, in connection with the sides and bottomparts, strengthen the conduit and cause it to endure the strain to which it may be subjected.

In Fig. 2 the flanges of the brace are dis-I pensed with, and piece, the rivets passing through the sides and bottom of the conduit directly through the the brace is made in one a sides and bottom of the brace. .The rivets 4 which connect the braces with the floor of the conduit also pass through the flanges of the irons or beams D, thus increasing the strength of the bracewith the floor.

Having thus described myinvention, what I claim as new, and desire to secure by Letters 1 Patent, is

1. A conduit constructed in pyramidal form, i

of sides A,and bottom B, substantially as and for the purpose set forth.

2. A conduit having braces which are connected with the sides and bottom of the conduit, substantially as and for the purpose set forth.

3. A conduit having braces which are connected at the sides and bottom of the conduit and sustain the slot-irons, substantially as and for the purpose set forth. v

4. A conduit formed of sides A, bottom B, braces O, and irons or beams D, all constructed and operating substantially as and for the purpose set forth.

HENRY D. WELSH.

Witnesses:

J OHN A. Wrnnnnsnnnu, A. P. GRANT. 

